The Nets won't have Kris Humphries for tonight's game against the Pacers. AP PHOTO

If the Nets are to break their four-game losing streak tonight, they’ll have to do it without their starting power forward.

Kris Humphries is sitting out tonight’s home game against the Pacers with what the Nets called a sore left shoulder. Shelden Williams will be starting at power forward in Humphries’ place.

Rookie forward Jordan Williams, who missed the preseason and the first week of the season with dehydration, is active for the first time in his career tonight.

Losing Humphries is another tough blow for a Nets team that is already struggling mightily. Humphries started the first five games of the season for the Nets, averaging 12.4 points and 10 rebounds per contest.

Humphries took hard spill in Sunday night’s loss at Cleveland, but continued playing. After the game, he was not icing the shoulder in the locker room. Nets coach Avery Johnson didn’t have many details before tonight’s game.

“[The injury] could have been from the fall, doc is checking him out,” Johnson said. “I just got the word on that 30 seconds ago, before I came out to talk with you guys.”

Humphries, best known for his 72-day failed marriage to reality star Kim Kardashian, has been a lightning rod for fans this season. He’s been booed heartily, just about every time he’s touched the ball, during Nets road games. He got an overwhelmingly positive reaction from the Prudential Center fans at the Nets’ only home game, on Dec. 27.